摘要:
The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.
摘要:
Die Erfindung betrifft ein Verfahren zum Betreiben eines elektrischen Gerätes, insbesondere einer Regelung für eine Heizungsanlage, mit einem dem Heizgerät direkt zugeordneten Regelgerät sowie mindestens einem Fernbedienungsgerät, einer Schaltuhr und/oder einem Raumthermostaten in einem zu beheizenden Raum, insbesondere an einer vom Regelgerät entfernten Position, einer Signalübertragung per Funk zur Kommunikation mit dem Regelgerät, einem Display als Anzeigevorrichtung für Betriebswerte und mit einer eigenen Stromversorgung mit Batterien, wobei das Display mit einer höheren Spannung als andere Bauteile des Gerätes betrieben wird und wobei die höhere Spannung mit einem Spannungsverstärker erzeugt wird. Mit der Erfindung soll der Stromverbrauch in einem batteriebetriebenen Fernbedienungsgerät, einer Schaltuhr und/oder einem Raumthermostaten reduziert werden. Erfindungsgemäß ist das Verfahren dadurch gekennzeichnet, dass über einen A/D-Wandler in einem Mikrocontroller der aktuelle Spannungswert der Batterien und/oder die Ausgangsspannung des Spannungsverstärkers gemessen und ausgewertet wird, und dass in Abhängigkeit dieser Auswertung der Verstärkungsfaktor des Spannungsverstärkers variiert wird.
摘要:
A steady state frequency control circuit for a variable frequency regulator including an open loop frequency control circuit, a frequency detector and a comparator circuit. The variable frequency regulator provides a clock signal indicating actual operating frequency and has a frequency control parameter for adjusting steady state operating frequency. The frequency detector receives the clock signal and provides a frequency sense signal which is compared with a steady state frequency reference signal to provide a frequency adjust signal. The frequency control parameter is adjusted by the frequency adjust signal to control steady state frequency. A method of controlling steady state frequency of a variable frequency regulator includes using open loop frequency control, determining the operating frequency and providing a frequency sense signal, comparing the frequency sense signal with frequency reference signal and providing a frequency adjust signal, and adjusting the frequency control parameter based on the frequency adjust signal.
摘要:
A zero-current start-up circuit (20) for a reference circuit (22) which is initially unbiased and which has internal nodes that need to be regulated to a predetermined voltage. When the start-up circuit (20) is enabled, a switching transistor (36) is turned on which enables the reference circuit (22) to generate an internal reference current which regulates an output current to a predetermined value set by the reference circuit (22). The output current flows through a voltage drop device (40 and 42) and when the voltage level reaches a predetermined value, the start-up circuit (20) is disabled eliminating the current path.
摘要:
A power system for providing a supply voltage to a computer and automatically varying said supply voltage responsive to the magnitude of the current being supplied to the computer, said power system comprising: a supply voltage circuit for generating at an output terminal said supply voltage and said current being supplied to the computer, said supply voltage circuit having a control terminal for receiving a control signal for varying said supply voltage between a first voltage level and a second voltage level in accordance with the magnitude of said control signal; and a current sensing circuit for sensing said current provided to the computer, said current sensing circuit generating at its output said control signal such that said control signal varies in magnitude in accordance with said current sensed, so as to vary said supply voltage between said first and second voltage levels.